June 20 : Ireland captain Caelan Doris has been forced out of their opening Nations Championship matches next month after suffering injury in Leinster’s United Rugby Championship triumph on Friday. Leinster hooker Dan Sheehan takes over as captain for the tests against Australia, Japan and New Zealand, the Irish Rugby Union said on Saturday. Doris hurt his foot early in Leinster’s runaway 36-7 victory over the Bulls at Crowe Park. Teammate Tommy O’Brien, who scored the opening try in Friday’s